Housing for vertical screw jacks



J. S. TOWNSEND. HOUSING FOR VERTICAL SCREW JACKS.

APPLICATION FILED DEC. 22, 1 920 Patented Aug. 8, 1922.

Z SHEETS-SHED 2- J. S. TOWNSEND. HOUSING FOR VERTICAL, SCREW JACKS.

APPLICATION FILED 05c. 22. I920 Pa i s 1522.

[SHEETS-SHEET 1.

"re n w c? all a as JOHN S. TOWNSEND, F HARVEY, ILLINOIS, ASSIGNOR TO WHITING CORPORATION, ()F

HARVEY, ILLINOIS, A CORPORATION OF ILLINOIS.

HOUSING FOB,

Specification of Letters Patent.

vna'rioanscanw JAGKS. V

Patented rin S, 1922.

Application filed December 22, 1.)20. Serial No. 432,572.

of Illinois, have lnvented a certain new and useful Improvement inIIousings for Vertical Screw Jacks, of which the following is a specification. I In constructing heavy duty screw'jacks, such as those illustrated for instance in I'Iardy Patent 1,085,734,issued February 3,

1914 it is necessary to enclose each power driven vertical screw 111 a suitable housing, which not only incidentally protects the screw fromcontact by persons passing near.

it, but essentially supports and braces the screw and carries the sideways load sustained by the screw. The object of this invention is to provide a housing for use in this class of devices which is unusually economical in that a comparatively light weight of metal is required, and is very strong and capable of etficiently and satisfactorily carrying out its mechanical function. The invention consistsin means for accomplishing the foregoing objects and in special features and details of construe tion which will be hereafter more fully set forth'in the specification and claims.

Referring to the drawings in which like numerals designate the same parts throughout the several views,

Figure 1 is a side elevation, partially in section, illustrating this invention in its preferred form.

Figure 2 is a plan sectional view taken at approximately the line 2-2 of Figure 1.

Figure 3 is a plan view of the top of the housing of Figure 1.

Figure 4 is a perspective view taken from below the cap at the top of the screw showing the details of that cap removed from other parts, which are shown in Figure 5.

Figure 5 is a perspective view looking down towards the top of the screw after the Figure 1 shows a conventional form of base casting in which is journalled the lower end 12 of the vertical power screw 14 sustained by the roller bearing 16 and the thrust of the worm wheel 18 driven by the worm shaft 20.

Screw 14 carries the lifting nut mechanism 22 carrying the lifting bar 24 of conventional form on which the load rests. i

The problem to be solved is to satisfactorily attach to-the base 10 a housing which will enclose, brace and support the screw 14 for the purposes heretofore referred to. In securing this desired result a special casting shown clearly in Figure 7 is'pr'ovided, havinga base portion26 adapted to be secured to the base 10 by suitable securing devices placed through the holes 28. Rising from opp'osite sides of this base 26 at points which in) assembled position are on opposite sides of the screw 14 are parallel vertical flanges 30. Rising from the base 26 between these flanges 30, but not connectedto the flanges, isa transverse vertical lug 32 braced on one side by an angular member 34. The casting shown in Figure 7 iscarefully machined adjacent to the unbraced face of the lug 32 and in the spaces 36 between the member 32 and the respective nembers' so that when the vertically disposed I-beam 40 extending upward the length of the screw is placed in the position shown in Figures 1 and it will closely fit all of the members 26,130 and 32 and may be easily secured in definite place by the sets of'screws 42 and 44. This beam 40 is so designed and positioned that two of its flanges 46 partially enclose the screw 14 as clearly appears in Figure 2. On the inside edges of these particular flanges 46 are riveted vertical-guide bars or track members 48 adapted to be enaged by jaws 50 of the nut guide casting 2. The fit oi these parts is such that as the L crew 14 is rotated thereby causing the nut 22 to travel along it, each jaw 50 travels along and is guided by its adjacent track member 48. In the particular form of the invention here shown the center of the screw 14 is off side of a line drawn through the centers of the track members 48. This, so as to allow the member 52 to be made of suflicient strength to completely enclose the screw and yet move up and down vertically clear of the I-beam 40.

The screw 14 has its upper end. cut away in the cylindrical knob 54 over which drops an upper end supporting casting 56 shown in perspective in Figure 4, provided at its opposite sides with jaws 58 adapted to engage the oppositeupper ends of the track getting into the. surfaces of engagement be members 48. Suitably attached to this member 56 is a cover plate adapted when installed in the position of Figures 1, 3 and 6 to engage the upper ends of the I-beams 4:0 and hold member 56 in position with refer ence 'to the length of the I-beam. The plate 60 also acts as a dust plate to keep dirt from tween the screw 14 and the member 56. This plate 60 rests loosely on the I-beam so that in theevent of the mechanism being so operated as to lift normal to strike the member 56, this'meinber 56 is lifted off 'from' the screw 14c and the I-beam 40 without damage which would occur werethismember 56 rigid on thebeam. r I

Hav ng thusdescribed my invent on what I claim asnew and desire to secure by Letters Patent,is:1 Y 1. llnv mechanism of the class described, a main base member, a vertical screw having its'lower end journalled therein, means for operating the screw carried in the-base, a cover plate casting for the base, partially enclosing the screw, lugs rising from the cover member, a single vertical I-beam interfitting with said lugs and enclosing three sides of thefsorew, means securing theI-beams to said lugs and means supporting the upper end of the screw in the upper end of the I- beam, v i I 2. In mechanism of the class described, a main base member, a vertical screw having itslower end journalled therein, means for operating the screwcarried in the base, a

cover plate casting for thebase, partially en closing the serew,lugs rising from the cover member, a vertical I-beam interlitting with said lugs restlng on the cover and enclosing the beam 24: higher than one side oi? the screw, means securing the I- beam to said lugs and means upper end of the screw in the upper end of the I-beam, said last means .beingremovable from the end of the beam when engaged by an object moved up to it by the screw.

In mechanism of the classdescribed, a base, a vertical screw rising from the base, lifting mechanism operatively associated with the screw, means for rotating the. screw to impart movements to the lifting mechanism, a cover for the base, flanges formed on and rising from said'cover, and an I-beam disposed in parallelism to and providing a protective housing for said screw,sa'id' beam having its web portion to one of the cover flanges and-its flange portions rigidly secured to other of said cover flanges 4. In mechanism of the class described, a base, a vertical screw rising from the base,"

lifting mechanism operatively associated with the screw, means for rotating the screw to im art vmovements to the liftin mecha supporting the rigidly secured a flanged beam disposed in parallelism 

